Beater for paper stock



'Feb.20,1923. I 1,446,154; f 1 n. s. CLARKE. y

BEATER /FOR PAPER STOCK.

FILIED muzi, 1.921 l z'sMEETs-sHx-:ET

Feb. 20, 1923.

R. S. CLARKE. BEATER FOR PAPER sTocK.

FILED IAN. 2|, |921.

2 SHEETS-SHEET 2'.

Patented Feb. 20, 1923.

UNITED sTATss PATENT OFFICE.

RALPH S. CLARKE, OF WALPOLE, MASSACHUSETTS', ASSIGNOR TO BIRD MACHINECOMPANY, A CORPORATION F MASSACHUSETTS.

BEATER ron PAPER sTocK.

Application filed January-21, 1921. Serial No. 438,966.

T o allwhom t may concern.

Be it known that I, RALPH S. CLARKE, a citizen of the United States,residing at Walpole, in the county of Norfolk and State ofMassachusetts, have invented certain new and useful Improvements inBeaters for Paper Stock, of which the following isa specification. f

This invention pertains to beaters for paper stock and more particularlyto those of the continuous type wherein a rotating screen or cylinder isemployed to remove the finer or graded stuff.

The main object of the present invention is to provide means foragitating the cylindrical screen, or, in other words, to impart avibratory motion to the screen in addition to the usual rotary movementabout its axis, such, vibratory movement causing a more ready inflow ofthe stuff into the screen and likewise acting to keep the Screenopenings clear.

A further object resides in the provision of means for regulating theoutflow from the screen, such means being present in the shape of a boxinto which the screened stock Hows,

the box being provided with suitable dam boards.

The machine is illustrated in the annexed drawings wherein:

Fig. lf/'s a top plan view of a portion of a beater with my improvedscreen applied thereto, together with the flow boX; f

Fig. 2 a vertical sectional elevation on the line II-II of Fig. 1;

Fig. 3 a transverse vertical section on the lineIII-III of Fig. 1;

Fig. 4 a detail sectional View on the line IV--IV of Fig. 5 of one ofthe eccentrics employed for raising the screen supporting arms; and

Fig. 5 a like view on the line V-V of Fig. 4. Y

In said figures 1 denotes the usual tub having a mid-feather orpartition 2. The screen 3 is of cylindrical form having a closed head 4adjacent the partition 2 while its opposite e-nd is open and providedwith a spider frame 5. The screen is secured to and rotatable with ashaft 6 journaled in suitable bearings 7 secured to a pair of I .spacedlevers or arms 8 and 9. Said arms are fulcrumed upon a shaft or rod 10which in turn is mounted in brackets 11 secured to a cross bar or timber12. 'Rotary motion is imparted to the screen from a driving pulley 13through a sprocket chain 14 passing about sprocket wheels 15 and 16respectively. The arms 8 and 9 incline upwardly toward their outer ends,see Fig. 2, and overlie a shaft 17 *.journaled in suitable bearings 1'8.Beneath yeach of the arms 8 and 9 the shaft is provided with aneccentric 19 about which passes a strap 20, the latter terminating in anupwardly extending bifurcated arm 21 beneath the elements of whichextends the lever or arm 8 or 9, as the case may be.

through pin 22 forms a connection between the lever and eccentricstrap.` Motion is im parted to shaft 17 and consequently to theAeccentrics 19 from a belt pulley 23 which is driven from any suitablesource.

Located beneath each lever is a buffer or bumper, shown as formed from ablock of rubber 24 having an overlying metallic cap 25 adapted to coactwith a screw 26 adjustably mounted in the lever. Said buffers, as

portion of its open side into a valved discharge pipe 27 which emptiesinto a box 28, the latter being provided with one Lor more The screendischarges through the lower -the levers are lowered, are put undercomdam boards 29 which control the level of the screened stock withinthe screen. For the most eicient operation of the machine it is founddesirable to determine the correct level and then hold such levelthrough the use of a dam board of proper height.

In operation the stock is caused to ow through the tub in the Ausualmanner and vdirection and a rotary motion is imparted Such bodilyraising coarser particles from the screen openings as the Screen. israised. rl`he raising and dropping of the screen is 'independent of orin addition tothe continuous rotary motlon of which the screen partakesand is foundl impractice to materially raise the efficiency of thescreen. As the gc entries near their limit of downward movement thescrews 26 come in contact with the striker blocks v25 and cause a comression of the underlying rubber block 24. Il`his arrangement preventsundue jar of the parts which might othprwise occur upon the falling ofthe frame, and also serves to assist the initial upward movement of theframe under the actionof -the eccentrics. The compound movementy of thescreen,I to-wit, its rotary movement about its axis and the up-and-downmovement through the stream of stock as it is passed aroundl through thetub causes an inflow of the graded stock through the openings (whicharel coextensive of the screen surface but only partially so shown), toa degree much more rapid than where the screen is alone rotated.

It is to be understood that in so far as the generic invention isconcerned, to-wit, raising and lowering the screen whilen'mpartingrotary motion thereto, any mechanism which will 1mpart such dual motionmay be employed, though that shown is simple and efficient.

What is claimed is,-

1. InY a beater for paper stock, the combination of a tub; a hollowscreen mounted upon a horizontal axis, said screen being located in linewith the run of material through the tub; means for rotating the screenabout its axis; and means for raising and lowering the screen while thesame,n

'the screen and simultaneously imparting to it an up-and-down movement.

3. In a beater for paper pulp, the conlbination of a tub; a hollow,perforate screen mounted for rotation about a horizontally disposedaxis, a portion only of the screen being submerged in the materialpassing through the tub; means for rotating the screen about its axis;and means for bodily raising and lowering the screen, whereby the screenis caused to surge down into the stream of material passing in contacttherewith.

4'. In a beater for paper stock, the combination of la tub; a framehinged at one end in line with the run of material through the tub; ahollow screen carried by said attenta periodically raised and loweredand a surging action of the same produced in the stream passing inyContact' with' the screen. 5. In a beater 'for paper stock,v thecombination of a tub; a frame pivotally sup-. ported at one end; a shaftcarried by the frame; a hollow screen carried by the shaft, thelowerportion of the screen extending down into the path of the stream ofmaterial passingthrough the tub; means for rotating said screen; aneccentric mechanism for raising and lowering the outer end of the frameand consequently imparting to the screen an up-and-down motion in thestream.

,GQ lin a beater for paper stock, the combination of a tub; a pair oflevers fulcrumed at one end; a shaft mounted in bearings on the leversintermediate their ends; a. hollow screenmounted upon the shaft, thelower portion of the screen extending into the tub and into the path ofmovement of tl stream passing therethrough; means for rotating the shaftand ,consequently the screen; a second shaft mounted in fixed bearingssupported upon the tub; a pair of eccentrics carried by said shaft, onebeneath-,each of the levers; straps connecting said eccentrics with saidlevers; and means for rotating said shaft and the eccentrics andtherebyimpartin an up-and-down movement to the screen. g. In a beater for paperstock, the combination of a tub; a pair of levers fulcrumed at one end;a shaft mounted in bearings on the levers intermediate their ends; a.hollow screen mounted upon the shaft, the lower 100 portion ofthe screenextending into the tub and into the path of movement ofthe streampassing therethrough; means for rotating the shaft and lconsequently thescreen; a second shaft mounted in fixed bearings supwe ported upon thetub; a pair of eccentrics carried by said shaft, one beneath each of thelevers; straps connecting Asaid eccentrics with said levers; means forrotating said shaft and the ecoentrics and/thereby im- 11o parting anup-and-down movement to thel screen; and a buer locatedin each lever,said buffer coming into action when the leve-rs near their limit ofdownward movement.

8. ln a beater for paper stock, the combination of a. tub; a framepivoted atene end; a hollow screen rotatably supported upon said frame;an eccentric mechanism for raising and lowering theframe; and a 12obuffer cooperating with the frame, said buffer coming into action as theframe nears its limi of downward movement. f .Y 9. lin a.V beater forpaper. stock, the combination of a tub; a hollow screen rotatably 125mounted with reference thereto and adapted to have its lower portionsubmerged in the stream of stock passing through the tub, one side ofthe screen adjacent the outer portion of the tub being open; :in outflowwe ipe extending from the tub adjacent the ower portion of the screen;and a flow box intoy which the pipe dischar es, said box being providedwith means or "maintaining 5 the level of the stock therein "andconsequentl Within the tub. f

10. a beater for paper stock, the combination of a tub; a hollow,perforate screen having its lower portion submerged in the tiontransverse to the flow of material past stock flowing through the tub;and means 10 for imparting a movement to the screen about its axis andsimultaneously imparting a bodily movement to the screen in a directhescreen. p

`In testimony whereof I have signed my name t0 this Specification.

RALPH S. CLARKE'.

